Fitting for revolving chairs and the like



March 4 ,1924.

R. K. DAWSON FITTING FOR REVOLVING CHAIRS AND THE LIKE Filed June 13.

Patented Mar. 4, 1924.

HE STAT ROBERT K. DAWSON, OF GUELPH, ONTARIO, CANADA.

FITTING FOR REVOLVING CHAIRS AND THE LIKE.

Application filed June 13, 1921. Serial No. 477,074.

To all whom it may concern."

Be it known that I, RoBnR'rK. DAWSON, a subject of the King of Great Britain, residing at Guelph, in the Province of On tario and Dominion of Canada, have invented a new and useful Improvement in Fittings for Revolving Chairs and the'like, of which the following is a specification.

This invention relates to fittings for use in connection with revolving chairs, and more particularly to mechanism for permitting the chair back to tilt relatively to the seat.

The objects of the invention are to provide means of improved. construction for enabling the back of the chair to tilt relatively to the seat thereof; also to provide means of improved construction for mounting the seat on the spindle; also to improve the construction of fittings of this kind in other respects hereinafter specified.

In the accompanying drawings:

Fig. 1 is a side elevation of a chair fitting embodying the invention.

Fig. 2 is'a fragmentary central sectional elevation thereof.

Fig. 3 is a perspective view of the means ior securing together the parts of the chair ase.

Fig. 4 is a fragmentary sectional plan view of the chair fitting on line 44:, Fig. 1. r I

Fig. 5 is a fragmentary sectional elevation thereof on line 55, Fig. 4.-

.Fig. 6 is a fragmentary sectional plan view thereof on line 6-6, Fig. 5.

A represents a chair leg, only one being shown for purpose of illustration, which is preferably provided at its inner end with an enlarged or shouldered portion a projecting beyond the upper and lower edges of the legs. a represents one of the corner.

pieces which are customarily arranged between the inner ends of the legs. The legs and corner pieces are preferably secured to gether by means of the following construction:

The upper faces of the legs A are adapted to be engaged by means of a sheet metal plate or disk B preferably having a peripheral, downwardly turned flange b engaging the edges of the shouldered portions a of the legs. These flanges also serve to hold the corner pieces a in place between adjacent legs. The lower faces of the legs and the corner pieces are engaged by a corresponding plate B having an upwardly turned flange b, and this plate ispreferably pro- .vided with a plurality of upwardly extending, substantially cylindrical bosses or portions 5 extending into correspondingly shaped holes in the lower faces of the legs A. The. cylindrical portions 6 are preferably formed integral withthe plate B by stamping or forming in suitable dies. If desired, the upper plate B'may also be provided with cylindrical projections of this type but these projections are preferably omitted from the upper plate asshown in the drawings. The projections are provided withcylindrical walls which in entering into the holesin the legs, securely .hold the legs in place withjregard to the plate B and which take the place of the usual wood screws heretofore provided for securing'the legs to the plates or the chair hub. ,Theplates B and B may be made of comparatively thin sheet metal so'thatthe cost of manufacture of the: same is. greatly reduced.

In order to prevent .the plates B and B from being bent or otherwise distorted, owing to the fact that they are made of relatively thin metal, suitable "reinforcing flanges or members are provided which engage 'the upper and lower leg engaging plates'to hold thesame in correct relation to the legs and prevent the buckling or warping of the plates due to strains to which the plates may lie subjected. In the construction shown for this purpose, reinforcing disks. flanges or members C and C'lare pro: videdwhich are adapted to engage portions of the legengaging plates. These reinforc: ing members are preferably. made somewhat smaller than'the'plate'sB B and the lower reinforcing member is preferably made of sufficient size to ,cover those portions ofthe lower leg engaging'plates which arefprovided with the bosses orspr'ojecti'ons 6 so as to hold these bosses securely in engagement with the chair legs' 7 The, reinforcing members may be pressed into clamping engagement with the leg engaging plates by any suitable means. clamping nuts D D" being employedin thepan ticular embodiment of the invention shown which may be moved in any suitable manner into positions to cause the reinforcing'members to engage the leg engaging plates. In the particular construction shown in the drawings,these nuts engage an upright cen arms and the upper portion of the connect-: v

i is provided at its other end with means for ing plate M is bent over to extend in a substantially horizontal direction and forms a reinforcing flange or webm for this plate.

This portion is preferablyof substantially truss shape having its greatest width in the middle portion thereof and provided at its opposite ends with portions m of reduced width, which form stops to limit the swinging oi the arms L about the pivots Z the stop portions m engaging the edges of the upright flanges of the U-shaped seat supporting member H.

The rearward swinging of the back of the chair is'opposed by means of a spring N, one end of which engages an adjusting screw n having a threaded engagement with a rod a, th other end of which extends through a hole in the connecting plate M adjacent to the truss shaped reinforcing flange m. The opposite end of the spring N, in the construction shown, engages a spring supporting cup or dished plate 0 which bears against a pivot or bridge member P provided at its opposite ends with integral rounded portions 39 engaging corresponding depressions in the edges of the upright legs of the U-shaped seat supporting member H. The intermediate portions of the bridge member P are preferably provided with inwardly extending reinforcing or stiffening flanges p which extend inwardly into the space between the upright legs of the seat supporting member H and thus prevent the bridge member from 1 moving lengthwise out of engagement with either of the flanges of the seat supporting member, as well as stiflening the bridge member against bending due to the action of the spring N.

-W hen the back of the chair is swung rearwardly, the back supporting arms L are swung downwardly about the pivots Z thus drawing the bolt or rod a against the action of the spring'N. When the pressure on the back of the chair is released, the arms L will swing upwardly until the stop portions 222. of the U-shaped connecting plate M engage the upright flanges of the seat supporting member H.

By means of the construction described, the seat and back supporting parts of the chair are extremely light in weight and simple to manufacture since they are made entirely of sheet metal parts bent into the desired forms. The base of the chair is particularly desirable since it greatly facilitates the assembling of the parts, owing to the fact that no wood screws are required to hold the legs on the hub portion of the chair. I

I claim as my invention:

1. In a chair, the combination of a seat supporting member having upwardly extending parts, a pair of back supporting arms each of which is pivotally secured at one end to one of said upwardly extending parts and extends rearwardly therefrom and supporting a chair back, a plate connecting said arms between the ends thereof and extendingtransversely thereof, a spring for drawing said plate toward said upwardly extending parts, parts on said plate adapted to engage said upwardlyextending parts to limit theinovement of said back' supporting arms in on direction and a bridge member pivotally engaging said upwardly extending parts and against which said spring bears. v j v 2. In a chair, the combination of a seat supporting member having upwardly extending parts, a pair of back supporting arms each ofwhich is pivotally secured at one end to one-of said parts and extends rearwar dly therefrom and is provided at its other end with means for supporting a chair back, a substantially upright transverse plate connecting said arms intermediate the ends thereof and having its upper portion bent to form a reinforcing flange, the ends of which are adapted to engage said upwardly extending parts to limit the swinging of said arms, and means for yieldingly holding said arms in position in which said flange engages said parts.

3. In a chair, the combination of seat supporting means including a substantially U- shaped member having upwardly extending parts, back supporting arms having end portions which are pivotally connected with said parts and intermediate portions extending at an angle to said end portions, a connecting plate secured to the intermediate portions of said arms, and resilient means connecting said U-shaped member and said connecting plate to oppose the movement of said arms in one direction.

4. In a chair, the combination of seat supporting means including a substantially U- shaped member having upwardly extending parts, back supporting arms having end portions which are pivotally connected with said parts and intermediate portions extending at an angle to said end portions, a connecting plate secured to the intermediate portions of said arms and having a substantially horizontal reinforcing flange, the ends of which are adapted to engage said upwardly extending parts to limit the movement of said back supporting arms in one direction, and resilient means connected with said connecting plate adjacent to said reinforcing flange and opposing the movement of said arms in the opposite direction.

5. In a chair, the combination of seat supporting means including a substantially U-shaped member having upwardly extending parts, back supportin arms having end portions which are pivota ly connected with said parts, a connecting plate secured to said arms and adapted to engage one edge of said new upright parts to limit the movement of said arms about their pivots in one direction, a

bridge member engaging the opposite edges porting means including a substantially U- shaped member having upwardly extending parts back supporting arms having end portions which are pivotally connected with said parts, a connecting plate secured to said arms and adapted to engage one edge of said upright parts to limit the movement of said arms about their pivots in one direction, a bridge member made of sheet metal and having bearing portions at its opposite ends which engage the opposite edges of said parts, and resilient means connecting said bridge member and said connecting plate to oppose the swinging of said arms in the opposite direction.

7. In a chair, the combination. of a seat supporting member having upwardly extending parts, a pair of back supporting arms pivotally secured to said parts and extending rearwardly therefrom, a substantially upright transverse plate connecting said arms and extending above said arms and having at its upper end an integral reinforcing flange, the ends of which are adapted to engage said upwardly extending parts to limit the swinging of said arms, and means connected with said plate above said arms for yieldingly holding said arms in a position in which said flange engages said parts. 7

ROBERT K. DAWSON. 

